Rihanna has gotten yet another tattoo, this one honoring her late grandmother Dolly, who passed away in June.

The 24-year-old R&B superstar posted this topless (but not totally scandalous) photo last night and wrote, "Goddess Isis- Complete Woman. Model for future generations- #GRANGRANDOLLY - always in and on my heart #1love."

Rihanna now has a total of 18 tattoos, including stars on her neck, a skull and cross bones on her ankle, and two guns under each arm, "Ssshhh" on her finger, Sanskrit Prayer going down her hip, a star inside her ear, the word "Love" on her left middle finger, roman numerals on her shoulder, a tribal sign on her hand, and the words "Rebelle Fleur" on her neck. Wonder what she's going to get next?